Why my tv screen white light

@behailu27567 if you are saying that your TV only shows a white screen, then this manes that your backlight is turning on but you are not getting any video. This can be caused by a bad main board as well as a bad buffer board on the LCD panel itself. WE will need to know your exact model and we will need to see your boards.

Unplug your TV and remove the back cover. Then take a look at all the boards and check for any burned/damaged component. Remove the ribbon cables and check those for tears, rips,corrosion. Take some good pictures of all of those boards and post those with your Question. That way we can see what you see and hopefully guide you further. Here is a guide for that Adding images to an existing question

Verify that your TV is a Samsung LN32D403